Sunflower, Tall, Fast Growing Fence, Pound 1 Lb Seeds Groco This is really a lot of seeds...1 pound of large seeds! Grow tall sunflowers and save the seeds for eating or use them for bird food. These grow about 6' tall with a large single head about 12" across. We cut theheads and lay them out on our driveway for the birds. Always attracts the bluejays. Can be used as a natural screen for privacy or to hide your garbage can, etc. There are approximately 2400 seeds in 1 lb. of these. Plant seeds 1/2" deep and 6" apart in full sun after danger of frost.